def test_single_writer(self):
class W:
pass
w = W()
self.assertEqual(w, output_writer.compose_writers([w]))
def test_multiple_writers(self):
class W:
pass
ws = [W(), W()]
w = output_writer.compose_writers(ws)
self.assertTrue(isinstance(w, output_writer.CompositeWriter))
self.assertEqual(list(w.writers), ws)
def test_writer_is_none(self):
self.assertEqual(None, output_writer.compose_writers([None]))
def test_empty(self):
self.assertEqual(None, output_writer.compose_writers([]))